Wireless-telegraph system.



No. 708,07l. Patented Sept. 2, I902.

G. w. PICKARD.

WIRELESS. TELEGRAPH SYSTEM.

(Applic'ation filed on. .29, 1901;

(No Model.)

n1: mums PETER; c0.v PnoTou'ma, WASHINGTON. u. c,

and contacts 12 and 13.

UNITED STATES PATENT OFFIC GREENLEAF W. PICKARD, E BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO CONSOLIDATED WIRELESS TELEGRAPH AND TELEPHONE COMPANY, A CORPORATION OF ARIZONA TERRITORY.

WIRELESS-TELEGRAPH SYSTEM.

SIECIFIGATION forming part of Letters Patent No. 708,071, dated September 2, 1902. Application filed October 29, 1901. Serial No. 80,388. (No model.)

T0 at whom it may concern:

Beit known that I, GREENLEAE W.PICKARD, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented'certain new and useful Improvements in Wireless-Telegraph Systems, of which the following is a specification.

This invention relates to improvements in wireless-telegraph syste ms; and the main Object of my invention is the provision in the receiving apparatus of a decohering device which has its power of tapping regulated according to the low or high resistance of the coherer. To attain this object, the'invention consists of a system of wireless telegraphy embodying novel features of construction and combination of parts substantially as disclosed herein.

In the drawing the figure is a diagrammatical view of the entire system.

Referring to the drawing, in which corresponding parts are referred to by similar references, A designates the transmitting apparatus, and B the receiving apparatus.

The receiving apparatus comprises the airplate 1,'to which is connected the conductorwire 2, which'has the coherer or imperfect electrical contact 3 also connected thereto, a conductor 4 connecting the coherer withthe ground 5. Connected to the wire 2 is a wire 6, which is also connected to the relay 7, having a wire 8 connected to the battery 9, this circuit completing itself through the short wire 10, wire 4, and the coherer.

The pivoted tongue or armature 11 of the relay is provided with a carbon or suitable metallic contact point or block 12, which forms an imperfect electrical contact with the similar point or block 13, so that the decohering-magnet 14 through the circuit made by the contacting of the points 12- and 13 is energized to operate the tapping armature orlever 15, which is provided with the metal plate 16, the tapper-ball 17, and the spring contact-plate 18. This circuit consists of the wire 19, the battery 20, the wire 21, the magnet 14, wire 22, the lever 15, the spring-plate 18, the adjusting-screw 23, Wire 24:, lever 11,

The sounder 25 is proved system is readily understood and its numerous advantages fully appreciated; but, briefly stated, the operation is as follows: The transmitting apparatus is operated to cause Hertzian waves to be transmitted,which are received by the air and ground plates of the receiving apparatus. As the coherer loses its resistance the relay is operated, causing the decoherer and the sounder to be operated simultaneously. The contactpoints 12 and 13 are of carbon or other material forming an imperfect electrical contact, the resistance depending upon the pressure between said points, diminishing with increased pressure and increasing with diminished pressure. This variation of resistance alters the current from the battery 20 to the tapper or decohering device, changing the strength of blow given to the coherertube, and as the pressure between the contact-points depends upon the current flowing through the relay 7 from the battery 9, this in turn being governed by the resistance of the coherer-tube, it is obvious that the force of the blow given by the tapper will be proportionate to the fall of resistance in the coherer, being light when the resistance of the coherer is high and heavy when it is low. I have found by experiment that such variations of the strength of the decohering taps are inadvantageous, and the operation of a wireless system is improved by having, when the impulses from the transmitting-station are feeble and the fall of resistance in the coherer slight, very light blows given by the tapper, and when the impulses are strong and consequently the fall of resistance in the coherer great, relatively heavy blows given by the tapper. If the receiving instrument is so arranged as to indicate not only the presence of a current, but also its intensity, a measure of the strength of the impulses could be made.

It is evident that I provide a decohering device in the receiving apparatus which is acted upon to operate according to the resistance of the coherer, so that the coherer may be decohered accordingly.

What I claim as new is 1. In combination with a wave-responsive device, a decohering means therefor, said decohering means having automatic means for regulating the operation thereof according to the resistance of the said wave-responsive device.

2. In combination with a Wave-responsive device, adecohering means therefor, comprising an electromagnetically-operated means, and a circuit to regulate the operation of said electromagnetically-operated means according to the resistance of the Wave-responsive device.

3. In a receiver for electrical oscillations, the combination of a receiving means, a circuit therethrough, a relay in said circuit, a decohering-circuit operated by said relay, a recorder-circuit in shunt to saiddecoheringcircuit, and an imperfect electrical contact regulated by the relay according to the resistance of the receiving means to energize the decohering-circuit accordingly.

4. In a receiver for electrical oscillations, the combination of a receiving means, a circuit therefor, a relay in said circuit, a decohering-circuit operated by said relay, a recorder-circuit in shunt to said decohering-circuit, a lever or armature operated by the relay to energize the recorder and decoheringcircuit, an imperfect electrical contact made by said armature regulated by the resistance of the receiving means, and a decohering means in said decohering-circuit.

5. In a receiver, the combination of receiving means, a circuit therefor, a relay in said circuit, a decohering-circuit operated by said relay, a recorder-circuit in shunt to said decohering-circuit, an imperfect electrical contact regulated by the relay according to the resistance of the receiving means to energize the decohering circuit, and a decohering means in said decohering-circui t.

6. In a receiver, the combination of receiving means, a circuit therefor, a relay in said circuit, a decohering-circuit controlled by said relay, a decohering means in said decohering-circuit, and means operated by the relay to regulate the decohering means according to the resistance of the receiving means.

In testimony whereof I affix my signature in presence of two witnesses.

GREENLEAF W. PIOKARD.

Witnesses:

TILLIE MILLER, F. LEE. 

